U.S. intelligence officials believe North Korea was centrally involved in the recent attack on Sony Pictures' computer network — possibly out of retribution for its film The Interview. Above, a security guard stands outside a theater during the film's premiere in Los Angeles last week. Kevork Djansezian/Reuters/Landov hide caption

itoggle caption Kevork Djansezian/Reuters/Landov

Ride-hailing services like Uber have changed ground transportation for both passengers and drivers. As Uber rapidly grows, it becomes more difficult for its drivers to keep up with the hustle. David Ramos/Getty Images hide caption

itoggle caption David Ramos/Getty Images